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The stepson of a man shot to death earlier this year was charged Monday with second-degree murder.

Court documents say police were investigating a tip that that the stepson, Zachary E. Collins, shot Glennis Parker because he thought Parker had been molesting the stepson's mentally disabled brother. The molestation allegation hasn't been proven.

Collins, who prosecutors say travels between Seattle and Portland, remained at large when charges were filed. If convicted, he faces a minimum of 15 years in prison for the crime, according to court documents.

Police found Parker in a 76 gas station parking lot, sitting in the driver's seat of his GMC truck. He'd been shot three times in the head and was unarmed.

Investigators initially said little about the Feb. 9 killing -- the third homicide in Seattle this year. But court documents show that in the days after the homicide, police wanted to talk to Collins, who had argued with Parker about an hour before he was found dead.

The morning of Feb. 9, Collins and Parker exchanged words at the Central District home where Parker and the stepson's mother lived, police were told. At 1:36 a.m. someone at the home called police.

At least two men could be heard in what police describe as a loud and aggressive argument. Parker's wife -- the stepson's mother -- can also be heard in the background. The call ended without the caller addressing the 911 operator.

The 911 dispatcher called back and the woman answered the phone. She said there was no problem other than a loud discussion, according to police.

Investigators believe the only people at the home were Parker, his wife, Collins and the disabled stepson.

Police were told Collins, 20, left the house before Parker, who later left by himself in the early morning. Parker's wife became concerned when he didn't answer the phone, and she went looking for him.

She drove to the shooting scene at Terry Avenue and James Street, but told police she didn't speak to anyone about what occurred or what happened at the shooting scene.

The woman arrived shortly after 4 a.m., about 90 minutes after Parker was found dead and was very distraught. Police say she told about a "loud discussion" her husband had with someone at their home earlier that morning. She initially wouldn't identity the other person, but later conceded it was her stepson, according to court documents.

Parker's widow told police her son left right after the initial 911 call and that she hadn't spoken to him. She also said she didn't have any contact numbers for him, according to court documents.

For several days after the shooting, detectives tried to find and interview Collins. His family continued to deny it had any contact with him, though police say that may not be the case.

On Feb. 11, detectives received a declaration signed by the stepson from a defense attorney in which he declined to speak with detectives. That defense attorney said Monday afternoon he was not representing Collins.

That same day, police received the anonymous tip that that the stepson shot Parker because he thought he'd been molesting the suspect's mentally disabled brother.

Early on the morning of February 9, a woman said a black man with dreadlocks aggressively approached her at Pike Street and Terry Avenue, coming west from Boren Avenue. The woman told police he was very upset and asked to use her phone to call his mother.

The man was crying and pacing, and allegedly said "I had to do it" because his brother was being hurt, according to police. The woman was given a six-photo montage and pointed out Collins as the person most closely resembling the man who used her phone, according to charging documents.

A Puget Sound Blood Center security guard also told police a man with "Rastafarian" style hair falling out from underneath a hooded sweatshirt ran down an alley after he several shots were fired at the 76 station.

Prosecutors are asking Collins be held on $1 million bail upon his arrest.